Figure 2: Dynamic drop shape profiles at different spreading voltages.
From: Voltage-induced spreading and superspreading of liquids
(a–c) show actual drop shape profiles viewed from the y-direction and (d–f) show digitized drop shape profiles. The profiles are shown as a function of time after a constant amplitude sine wave voltage (10 kHz) is applied to the electrodes: a and d just below the threshold voltage (200 V, V/VTh=0.87): b and e just above the threshold voltage (240 V, V/VTh=1.04); and c and f further above the threshold voltage (270 V, V/VTh=1.17). In panels d–f digitized profiles are shown at times 0, 1 ms (dashed), 3 ms, 5 ms, 10 ms (dashed), 30 ms, 50 ms, 100 ms (dashed) and 300 ms. The red dashed lines shown in a–c are fits to circular arcs. (g) Shows equilibrium (long time limit) droplet shapes viewed from the y-direction for a range of different spreading voltages from 200 to 270 V. The vertical scale in g is expanded by a factor of 2 compared with the horizontal scale so that the spread film at 270 V can be clearly seen.
